CAJ | 학술논문

连续油管钻水平井过程中，井底岩屑在重力作用下容易沉积在井壁下侧，形成岩屑床；连续油管又受到排量小、钻柱无法旋转等因素限制，造成井眼净化效率较低。针对这一问题，在欧拉坐标系下考虑相间滑移速度和颗粒流的影响，建立了微小井眼水平井岩屑运移的混合物漂移模型，采用Realize κε湍流模式及SIMPLEC算法进行数值计算，研究了钻井液排量、环空偏心度、岩屑直径、井斜角和钻井液黏度等参数对偏心环空岩屑运移的影响，得到了各种条件下环空岩屑速度和浓度的分布规律。研究表明：随着钻井液排量增大、环空偏心度减小、岩屑直径减小、井斜角减小及钻井液黏度提高，连续油管水平井岩屑运移效率提高。
련속유관찬수평정과정중，정저암설재중력작용하용역침적재정벽하측，형성암설상；련속유관우수도배량소、찬주무법선전등인소한제，조성정안정화효솔교저。침대저일문제，재구랍좌표계하고필상간활이속도화과립류적영향，건립료미소정안수평정암설운이적혼합물표이모형，채용Realize κε단류모식급SIMPLEC산법진행수치계산，연구료찬정액배량、배공편심도、암설직경、정사각화찬정액점도등삼수대편심배공암설운이적영향，득도료각충조건하배공암설속도화농도적분포규률。연구표명：수착찬정액배량증대、배공편심도감소、암설직경감소、정사각감소급찬정액점도제고，련속유관수평정암설운이효솔제고。
During the course of drilling horizontal well with coiled tubing ,cuttings easily settle on the low side of borehole to form cuttings bed due to action of gravity .The features in the coiled tubing drilling , such as small pumping rate and no rotation in drill string etc ,have made hole cleaning efficiency very low . In view of this problem ,considering the interphase slip velocity and particle flow influence based on the Eu-lerian coordinate system ,a mixture drift model of cuttings carrying in a horizontal slim-hole was estab-lished ,w hich uses Realize κεturbulence model and the SIM PLEC algorithm for numerical calculation ,and studied the effects on eccentric annular cuttings migration by flow rate ,annular eccentricity ,cuttings size , mud viscosity and hole angle ,to determine distribution pattern of cuttings velocity and concentration in an-nular space under all conditions .The study shows that cuttings carrying efficiency will increase in coiled tubing drilling horizontal wells with the change of several factors ,i .e .the increase of flow rate of drilling fluid ,the decrease of annular eccentricity ,decrease of cuttings size and well inclination ,and the increase of mud viscosity .